package com.test.chapter2;

import java.io.IOException;
import java.util.Iterator;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.MapReduceBase;
import org.apache.hadoop.mapred.OutputCollector;
import org.apache.hadoop.mapred.Reducer;
import org.apache.hadoop.mapred.Reporter;

public class MaxTemperatureReducer extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable> {

	@Override
	public void reduce(Text key, Iterator<IntWritable> values, OutputCollector<Text, IntWritable> output,
			Reporter reporter) throws IOException {
		
		int maxValue = Integer.MIN_VALUE;
		
		while(values.hasNext())
		{
			maxValue = Math.max(maxValue, values.next().get());
		}
		
		output.collect(key, new IntWritable(maxValue));
	}

}
